Expansion drill for boring wells



. J. 'F. DYE.

' EXPANSION DRILL FORBORING WELLS. No. 349,700-. r Patented Sept. 28, 1886.

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UNITED STATES PATENT QFFICE.

JOSEPH F. DYE, OF SANTA PAULA, CALIFORNIA, ASSIGNOR OF ONEHALF TO SUTHERLAND BUTTON.

EXPANSION-DRILL toe BORING WELLS.

SIECZFECATION forming part of Letters Patent No, 349,700, dated September 28, 1886.

Application filed February 1, 1886.

To all whom it may concern.

Be it known that I, JosEPH FRANKLIN DYE,

a citizen of the United States, residing at Santa Paula, in Ventura county, State of California, have invented a new and useful Improvement in Expansion-Drills for Boring \Vells,of which the following is a specification.

My invention relates to tools adapted for drilling wells which have to be eased.

Great difficulty has always been experienced in boring wells which have to be cased while the work is progressing, owing to the faetthat after the casing has been placed in the well the size of the hole drilled below the casing is necr 5 essarily no greater in diameter than the inside diameter of the casing, for the reason that the tools used to drill the hole must be inserted through the casing, and therefore must be as small in diameter as the casing.

The object of my invention is to devise means whereby the hole below the casing can be made equal in diameter to the outer diameter. of the casing, so that after the casing is put in it will follow the tools down as the hole is deepened. I accomplish this by means of the device described herein,and illustrated in the accompanying drawings, in Which-- Figure 1 shows myimproved expansion-drill in position at the'bottom of the well, with the casing far enough above the bottom of the well to allow the drillto operate properly. 7 The cap A is removed to expose the inside of the ease, and the jaris down upon the drill-bits in the po sition it assumes at the end of every full stroke. 5 Fig. 2 is a sectional view of the bottom of the well, showing the tool as it appears when it is raised for a stroke. Fig. 3 shows the drill as it appears when being drawn up out of the wellwhen the casing has pressed the ends of 0 the drill-bits together.

My invention consists in constructing the drill of two separate bits pivoted in a case, so that the cutting ends of the bits may be spread apart or closed together at pleasure.

It further consists in the peculiar construction of the jar and the case which holds the drill and the jar.

A B is the case in which the drill-bits and jar are secured, A being a removable cap secured in place by means of bolts.

Serial No. 190,410. (No model.)

. D is the rod to which the tool is attached.

E is the temper screw-nut.

F is thejar with the two jaws G.

H is the chamber-in the ease in which the jar and drill-bits are secured. I is the pivot-bolt which secures the bits in the case.

- J is the spring which holds the cutting ends L L of the bits apart.

QQ are the lever ends of the-drill-bils.

- The two drill-bits L Qand L Q are similar in shape, each having a shoulder, P,whieh fits against the side wall, 0, of the case. The lever ends of the drill-bits tapersufticiently to give such lateral play to the bitsas may be desired. The jaws G of the jar extend between the side walls, 0, and the lever ends Q, and are tapering upon their inner faces inward and upward, so that when the jar is down at the close of a stroke the lever ends will be pressed together and the cutting ends apart, and when the jar is raised the lever ends are left free to be spread apart when the cutting ends are pressed together to pass through the casing. The spring J will. tend to keep the cutting ends of the bits spread apart at all times. I v

' It will be observed that in drilling with this device a double stroke will be given upon each downstroke of the rod Dthat is to say, when the tool is elevated, as shown in Fig. 2, the first effect of letting it drop will be to cause the cutting-edge X of the bits to be driven into the rock by the force of the falling weight ofthe case A. Then a second stroke is given by the weight of the jar F and the rod D fall.- ingthrough the space between the jar and the lever ends of the bits. The force of this blow can be regulated by screwing the temper screwnut E up or down. I

In the drawings the temper screw-nut is at such a point as to distribute the force of the blows equally upon the case and the ends of the drill-bits. By lowering the nut the blow will all fall upon the case, which will transmit 9 5 it to the bits by the shoulders P. jBy raising thefnut the whole force of the blow will be made to fall upon the lever ends of the drillbits.

If desired, the jar F can be wholly dispensed I00 with by screwing the temper-nut close down upon the case, thus leaving no play of the jar, and depending upon the spring J to hold the ends of the bits apart when the blow is given.

In the drawings, S represents the rock through which the well is drilled; 'I, the cas ing, and V a knob which is left between the bits, but breaks off from time to time as the boring progresses".

By withdrawing the pivot-bolt I the drillbits will be released, and they'may be drawn out of the case and replaced by other bits.

It will be seen that when the cuttingedges of the drill-bit are spread apart, as shown in Figs. 1 and 2, the length of the cutting-edge ot' the drill will be greater than. the inner di ameter of the casing through which it is inserted, and is thereby caused to cut a hole larger in diameter than the casing, so as to allow the casing to pass down the well, and that whenever the tool is drawn. through the casing, the drill will be compressed by the casing, so as to allow it to pass therethrough.

Tools having different shaped cutting-edges for reaming, 850., may be substituted for the drill-bits shown.

I am aware that expansion-drills haveheretot'ore been constructed with two bits pivoted lpivotally-mounted. drill-bits terminating in Guttingedges, as shown, the case A B, pivotbolt I, and spring J.

2. In a well-boring tool, the combination of the case A B, the drill-bit, and the jar F, mounted upon the end of the rod D, and seated in the chamber H, substantially as and for the purpose set forth.

3. In a well-boring tool substantially such.

as set forth, and in combination with the pivotally-mounted drill-bits L Q and L Q, the bifurcated jar F G.

4. In a wellboring tool, the combination, substantially as set forth, of the case A B, drill-bits Q L Q L, pivot-bolt I, spring J, jar F, rod D, and temper screw-nut E.

5. In a well-boring tool substantially such as described, the pivoted drill-bits L Q and L Q and the spring J, in combination, as set forth-that is to say, the cuttingedge of the tool is at the end of the bits, and the spring is so mounted as to force the bits apart, whereby the length of the cutting-edge ot' the tool when the bits are free greater than that which the tool may be made to present when the bits are pressed toward each other.

J. F. DYE.

XVi tn esses:

JAS. R. TowNsENn, ELLA LEeHLnn. 

